Semiconductor Mask Layout Etching for Uniform Pattern Transfer
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Solution Overview
Problem
The existing photolithography process in semiconductor manufacturing faces challenges in implementing high-quality pattern transfer due to inconsistent spacings between mask structures, leading to loading effects and poor stability during etching, which affects the uniformity and performance of semiconductor devices.
Innovation Solution
A method is introduced where initial mask structures are etched at the edge region with a different extension direction than the mask structures, forming mask structures that maintain consistent spacing, which are then used to etch the material layer, reducing loading effects and improving pattern transfer stability and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography process is used to transfer pattern from mask to substrate, then pattern transfer is achieved, but inconsistent spacings between mask structures cause loading effects and poor stability during etching
Solution Approach 1:
The substrate is divided into multiple regions (first regions extending along first direction, second regions extending along second direction) with different etching requirements. This segmentation allows independent optimization of etching processes for different regions, resolving the contradiction by enabling precise control of pattern transfer quality in each region while maintaining overall etching stability through region-specific parameter adjustment.
2Speed
If device sizes are continuously reduced to improve operation speed, then operation speed is improved, but existing photolithography process becomes inadequate
Solution Approach 1:
Different regions of the substrate are assigned different local qualities through region-specific etching parameters and processes. First regions and second regions have different extension directions and etching requirements, allowing each region to be optimized for its specific function. This local quality approach enables continued device miniaturization while maintaining pattern transfer quality by adapting process parameters to local requirements rather than using a uniform approach.
3Reliability
If mask structures with consistent spacing are formed to reduce loading effects, then etching stability is improved, but process complexity increases
Solution Approach 1:
The patent merges multiple etching operations into a unified region-based etching framework. By defining first and second regions with different extension directions and applying appropriate etching processes to each, the method consolidates what would otherwise require multiple separate mask and etching cycles. This merging approach maintains etching stability through consistent spacing in critical regions while reducing overall process complexity compared to traditional multi-step approaches.
Data Source
AI summary
A semiconductor structure and a method for fabricating the semiconductor structure are provided in the present disclosure. The method includes providing a substrate, wherein the substrate includes a plurality of first regions to-be-etched extending along a first direction; a first region to-be-etched includes a central region and an edge region adjacent to each of two sides of the central region; and a material layer to-be-etched is on the substrate; forming a plurality of discrete initial mask structures on the material layer to-be-etched; etching initial mask structures at the edge region till a surface of the material layer to-be-etched is exposed to form a plurality of mask structures; using the plurality of mask structures as a mask, etching the material layer to-be-etched to form a plurality of discrete layers to-be-etched; and removing layers to-be-etched at the central region till a surface of the substrate is exposed.